package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Transactional//事务管理，因为要添加菜品还要添加口味
    @Override
    public void insertDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dish.setStatus(StatusConstant.ENABLE);
        dishMapper.insertDish(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size()>0 ){
           flavors.forEach(dishFlavor -> {
               dishFlavor.setDishId(dishId);
           });
           dishFlavorMapper.insertDishFlavors(flavors);
        }

    }

    @Override
    public PageResult pageDish(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageDish(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());

    }


    @Transactional
    @Override
    public void deleteDish(List<Long> ids) {
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        Integer count = setmealDishMapper.countByDishId(ids);
        if (count > 0){
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        dishMapper.deleteById(ids);
        dishFlavorMapper.deleteByDishId(ids);

    }

    @Override
    public DishVO getDishByid(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }


    @Transactional
    @Override
    public void updateDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.updateDish(dish);


        dishFlavorMapper.deleteByDishId(Collections.singletonList(dishDTO.getId()));
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size()>0 ){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertDishFlavors(flavors);
        }


    }

    @Override
    public void updateDishStatus(Integer status,Long id) {
        Dish dish = new Dish();
        dish.setStatus(status);
        dish.setId(id);

        dishMapper.updateDishStatus(dish);
    }

    @Override
    public List<Dish> getByCategoryId(Long id) {
        Dish dish = new Dish();
        dish.setCategoryId(id);
        List<Dish> dishList = dishMapper.getByCategoryId(dish);
        return dishList;
    }

    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.getByCategoryId(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
